1978-10-17
1981-06-02
Corbin, John K.
G02B 1518
Patent
active
042708486
ABSTRACT:
This optical image enlarging variator comprises two coaxial components adapted to give from a fixed virtual image located at the rear of the front component, a fixed real image, located at the rear of the rear component; the magnification varies as a function of the relative position of the two components movable in relation to each other and to the fixed position of the diaphragm; the front component is divergent, comprises four lenses and the rear component also comprises four lenses; in one of their relative positions, g1=g2==G=1, and irrespective of the relative positions of these components the following requirements: 0.20<g1<1.60 and 0.25<g2<1.50 are met, as well as condition f2/f1>1.2, wherein g1 is the image magnification produced by the front component, g2 the image magnification produced by the rear component, and G the image magnification produced by the complete device, f1 being in absolute value the focal length of the front component and f2 the focal length of the rear component.
REFERENCES:
patent: 3507555 (1970-04-01), Isshiki
patent: 3609005 (1971-09-01), Nakamura
patent: 3884555 (1975-05-01), Suwa et al.
Corbin John K.
Striker Michael J.
Sugarman Scott J.
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